Heavy crude oil flowing like a river through a central Arkansas neighborhood could keep residents away for several more days as crews work to clean it up. The oil began spilling into the Mayflower, Arkansas, subdivision Friday from a 2- or 3-inch gash in the Pegasus pipeline, which carries Canadian crude from Patoka, Illinois, to Nederland, Texas, according to a state transportation engineer. The cause of the leak was undetermined, he told CNN affiliate KARK in Little Rock.